Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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SUPERNUMERARY TEETH IN MANDIBULAR INCISOR REGION

하악 절치부에 발생한 과잉치

  • Mah, Yon-Joo (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Lee, Jae-Ho (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Song, Je-Seon (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Choi, Byung-Jai (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Kim, Seong-Oh (Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University)
  • 마연주 (연세대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 이제호 (연세대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 송제선 (연세대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 최병재 (연세대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 김성오 (연세대학교 치과대학 소아치과학교실 및 구강과학연구소)
  • Published : 2009.11.30
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Abstract

Pediatric dentists often meet children with abnormal in number of tooth. Presence of supernumerary teeth is frequent cause of malocclusion. Etiology for supernumerary teeth is not yet clearly defined, but it is thought to be caused by excessive proliferation of dental lamina by hereditary and environmental factors. Supernumerary teeth occur in the maxilla nine times more frequently than in the mandible. Most common supernumerary tooth is the mesiodens in the maxilla, and some are observed in the maxillary molar and mandibular premolar. It occurs rarely in the mandibular incisor region with the incidence of 1-2% among all supernumerary teeth. A six-year old boy visited the department of the pediatric dentistry, Yonsei University Dental Hospital, with the chief complaint of crowded supernumerary teeth on the mandibular incisor region. Clinical and radiographic examinations revealed six permanent mandibular incisors similar in size, shape, and length. Further investigation using computed tomography(CT) was proceeded on the mandible to measure and compare morphologic features and positions of the six incisors. Then, we decided to remove two incisors which were already erupted. Periodic check-up was followed to monitor the dental development and spontaneous positional enhancement of the remaining four incisors in the mandible.

소아치과 영역에서 치아수의 이상은 흔히 관찰할 수 있으며, 그 중 대표적인 것의 하나가 과잉치이다. 과잉치의 발생원인에 대해서는 여러가지 가설이 있으며 유전적 또는 환경적 요인에 의해 치배 형성기의 정상 치판이 과도하게 증식하여 발생되는 것으로 알려져 있다. 과잉치가 가장 흔하게 발생되는 부위는 상악에서는 절치부로 그 빈도는 80-94% 정도로 보고되고 있고 그 다음으로는 구치부와 소구치부 순서로 나타난다. 상악에 비해 하악에서는 대부분 소구치 부위에서 발생되며 절치부에서는 전체 과잉치 발생빈도 중 단지 1-2% 이하로 매우 낮은 빈도로 발생되는 것으로 보고되고 있다. 이 증례는 드물게 나타나는 하악 절치부에 2개의 과잉치가 있다는 주소로 내원한 만 6세 남아에서, 임상 및 방사선학적 검사 결과 하악 절치부에 정상치와 크기와 형태가 비슷한 정상치형의 과잉치 2개를 포함하여 6개의 절치가 존재하는 것이 관찰되었다. 발치할 치아의 정확한 진단 및 결정을 위해 컴퓨터 단층 촬영을 시행하였고 발치 후 하악 전치부의 정상적인 배열을 위해 치아 맹출에 대한 주기적 정기 검진 후 교정적 평가와 치료를 진행할 예정이다.

Keywords

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